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+! {dg-do run}
+!
+! PR libfortran/20660 and other bugs (not filed in bugzilla) relating
+! to negative units
+!
+! Bugs submitted by Walt Brainerd
+ integer i
+ logical l
+
+ i = 0
+! gfortran created a 'fort.-1' file and wrote "Hello" in it
+ write (unit=-1, fmt=*, iostat=i) "Hello"
+ if (i <= 0) call abort
+
+ i = 0
+ open (unit=-11, file="xxx", iostat=i)
+ if (i <= 0) call abort
+
+ inquire (unit=-42, exist=l)
+ if (l) call abort
+
+ end